cabal
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Add a ci test for cabal-install self-upgrade policy
In 6c2eba7fca96872b6c8e3bde711feadf3491427f we clarified our cabal-install
support policy with respect to self-upgrade: upgrading to the latest version with cabal install cabal-install
must work with all cabal-install
versions released in the last three years. As discussed in #4250, we should also have a CI check that this guarantee actually holds. Testing that cabal install Cabal/ cabal-install/
succeeds with cabal-install
1.18 should be enough.